[(0,1),(0,2),(1,2),(2,3),(3,4),(1,4),(3,5),(4,6),(6,7),(5,8),(6,8),(5,9),(7,9),(7,10),(9,11),(11,12),(12,13),(13,14),(10,14),(12,15),(13,16),(15,17),(15,18),(17,18),(16,19),(19,20),(18,21),(8,22),(21,22),(20,23),(10,23),(19,24),(20,24),(23,25),(17,26),(22,26),(11,27),(27,28),(27,29),(25,30),(25,31),(28,32),(21,33),(28,34),(16,35),(24,36),(26,37),(14,38)]
[(0,1),(1,2),(0,2),(1,3),(3,4),(2,4),(4,5),(3,6),(5,6),(6,7),(7,8),(5,8),(7,9),(8,10),(10,11),(9,11),(9,12),(12,13),(11,13),(10,14),(14,15),(12,16),(16,17),(15,18),(14,19),(13,20),(15,20),(17,21),(17,22),(18,22),(20,23),(19,24),(23,25),(24,25),(18,26),(23,26),(24,27),(27,28),(27,29),(16,30),(21,31),(28,32),(21,33),(26,34),(22,35),(28,36),(25,37),(19,38)]
